The INDEXF command is used to analyze, defragment, truncate
    or extend the INDEXF.SYS file. The analyze option reports the
    current fragmentation state, whereas the defragment and extend
    option allows defragmentation or pre-extending of INDEXF.SYS.
    Truncate is an option which trims down INDEXF.SYS to the end-of-
    file size. To perform a defragment truncate or extend operation
    the disk must be completely dismounted. Defragment truncate and
    extend require VOLPRO privilege. Defragment truncate and extend
    can not be done on the system disk.
 Syntax :

    INDEXF device/Qualifiers